Paratherina striata fish, one of the 16 endemic fish species found in Lake Mahalona, East Luwu Regency, South Sulawesi. Currently, these fish have been listed as threatened species in the red list since 2019. The aim of this study was to analyze the fecundity and egg diameter of P. striata in Mahalona Lake. The research was conducted at Mahalona Lake from November to December 2021 and February 2022. Samples were collected using gill nets and were separated by sex based on morphological characteristics of the body and gonads. The gonads were preserved in Gilson solution. The relative fecundity of P. striata varied between 177 and 1271 eggs. The analysis of regression coefficients for the relationship between fecundity and body length (0.194) and fecundity and body weight (0.169) indicated a weak relationship between them. The diameter of the eggs inside the gonads varied. The spawning type of P. striata was categorized as a partial spawner.